Air conditioning device for railway vehicle and air conditioning method for railway vehicle
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Solution Overview
Problem
In railway vehicles, the compressor heater cannot heat the compressor when the pantograph is lowered, leading to difficulties in preventing galling and overloading due to refrigerant accumulation, which affects the compressor's longevity.
Innovation Solution
A power storage device, such as a capacitor, supplies power to a compressor heater, allowing it to heat the compressor even when the overhead line power is interrupted, facilitating refrigerant gasification and preventing malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heater is used to heat the compressor before activation, then refrigerant gasification and separation from lubricating oil is achieved, preventing galling and overloading, but the heater cannot operate when the pantograph is lowered and overhead line power is interrupted
Solution Approach 1:
The control unit performs preliminary heating of the compressor using the heater before the compressor is activated. This preliminary action ensures that refrigerant is gasified and separated from lubricating oil before the compressor starts operating, preventing galling and overloading. The heating is performed in advance during periods when power is available, so that when the compressor needs to start, the refrigerant is already in a safe state.
Solution Approach 2:
The control unit acts as an intermediary that manages the heating operation based on power availability. It monitors the state of the pantograph and overhead line power supply, and intelligently controls the heater operation accordingly. When power is available, it enables heating; when power is interrupted, it prevents heating requests, thus mediating between the heater's operational needs and the power supply constraints.
2Duration of action of stationary object
If the compressor is heated continuously to prevent refrigerant accumulation, then compressor longevity is improved, but power consumption increases during operation
Solution Approach 1:
The heater operates periodically rather than continuously. The control unit determines heating intervals based on operational conditions, power availability, and compressor state. Heating is performed at specific intervals before compressor activation and during power interruptions, rather than running constantly. This periodic heating approach maintains compressor reliability while significantly reducing overall power consumption compared to continuous heating.
Solution Approach 2:
The system changes the heating parameter from continuous to conditional/intermittent based on operational state. The control unit adjusts the heating duration, intensity, and timing according to factors such as whether the pantograph is raised, whether the compressor is about to start, and current refrigerant state. This dynamic parameter adjustment optimizes the balance between protecting the compressor and minimizing power consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables continuous heating of the compressor, preventing refrigerant accumulation and ensuring long-lasting compressor use by maintaining the compressor in a gasified state during power interruptions.
Implementation Method 1
Heating the compressor by use of the heater before activating the compressor enables gasification of refrigerant accumulated in the compressor
Implementation Method 2
A power storage device, such as a capacitor, supplies power to a compressor heater
Data Source
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AI summary
A compressor (110) compresses refrigerant using power supplied from an overhead line to a railway vehicle. A cooperating devices group forms, together with the compressor (110), a refrigeration cycle for performing air conditioning of a passenger compartment of the railway vehicle. A compressor heater (200) is supplied power to heat the compressor (110). A power storage device (300) stores, during a time period in which power is supplied from the overhead line to the railway vehicle, a portion of the power, and supplies, during a time period in which power supply from the overhead line to the railway vehicle remains interrupted, power stored therein to the compressor heater (200).